/[gxemul]/trunk/src/disk/bootblock.c
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Contents of /trunk/src/disk/bootblock.c

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Revision 42 - (show annotations)
Mon Oct 8 16:22:32 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 9360 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1613 2007/06/15 20:11:26 debug Exp $
20070501	Continuing a little on m88k disassembly (control registers,
		more instructions).
		Adding a dummy mvme88k machine mode.
20070502	Re-adding MIPS load/store alignment exceptions.
20070503	Implementing more of the M88K disassembly code.
20070504	Adding disassembly of some more M88K load/store instructions.
		Implementing some relatively simple M88K instructions (br.n,
		xor[.u] imm, and[.u] imm).
20070505	Implementing M88K three-register and, or, xor, and jmp[.n],
		bsr[.n] including function call trace stuff.
		Applying a patch from Bruce M. Simpson which implements the
		SYSCON_BOARD_CPU_CLOCK_FREQ_ID object of the syscon call in
		the yamon PROM emulation.
20070506	Implementing M88K bb0[.n] and bb1[.n], and skeletons for
		ldcr and stcr (although no control regs are implemented yet).
20070509	Found and fixed the bug which caused Linux for QEMU_MIPS to
		stop working in 0.4.5.1: It was a faulty change to the MIPS
		'sc' and 'scd' instructions I made while going through gcc -W
		warnings on 20070428.
20070510	Updating the Linux/QEMU_MIPS section in guestoses.html to
		use mips-test-0.2.tar.gz instead of 0.1.
		A big thank you to Miod Vallat for sending me M88K manuals.
		Implementing more M88K instructions (addu, subu, div[u], mulu,
		ext[u], clr, set, cmp).
20070511	Fixing bugs in the M88K "and" and "and.u" instructions (found
		by comparing against the manual).
		Implementing more M88K instructions (mask[.u], mak, bcnd (auto-
		generated)) and some more control register details.
		Cleanup: Removing the experimental AVR emulation mode and
		corresponding devices; AVR emulation wasn't really meaningful.
		Implementing autogeneration of most M88K loads/stores. The
		rectangle drawing demo (with -O0) for M88K runs :-)
		Beginning on M88K exception handling.
		More M88K instructions: tb0, tb1, rte, sub, jsr[.n].
		Adding some skeleton MVME PROM ("BUG") emulation.
20070512	Fixing a bug in the M88K cmp instruction.
		Adding the M88K lda (scaled register) instruction.
		Fixing bugs in 64-bit (32-bit pairs) M88K loads/stores.
		Removing the unused tick_hz stuff from the machine struct.
		Implementing the M88K xmem instruction. OpenBSD/mvme88k gets
		far enough to display the Copyright banner :-)
		Implementing subu.co (guess), addu.co, addu.ci, ff0, and ff1.
		Adding a dev_mvme187, for MVME187-specific devices/registers.
		OpenBSD/mvme88k prints more boot messages. :)
20070515	Continuing on MVME187 emulation (adding more devices, beginning
		on the CMMUs, etc).
		Adding the M88K and.c, xor.c, and or.c instructions, and making
		sure that mul, div, etc cause exceptions if executed when SFD1
		is disabled.
20070517	Continuing on M88K and MVME187 emulation in general; moving
		the CMMU registers to the CPU struct, separating dev_pcc2 from
		dev_mvme187, and beginning on memory_m88k.c (BATC and PATC).
		Fixing a bug in 64-bit (32-bit pairs) M88K fast stores.
		Implementing the clock part of dev_mk48txx.
		Implementing the M88K fstcr and xcr instructions.
		Implementing m88k_cpu_tlbdump().
		Beginning on the implementation of a separate address space
		for M88K .usr loads/stores.
20070520	Removing the non-working (skeleton) Sandpoint, SonyNEWS, SHARK
		Dnard, and Zaurus machine modes.
		Experimenting with dyntrans to_be_translated read-ahead. It
		seems to give a very small performance increase for MIPS
		emulation, but a large performance degradation for SuperH. Hm.
20070522	Disabling correct SuperH ITLB emulation; it does not seem to be
		necessary in order to let SH4 guest OSes run, and it slows down
		userspace code.
		Implementing "samepage" branches for SuperH emulation, and some
		other minor speed hacks.
20070525	Continuing on M88K memory-related stuff: exceptions, memory
		transaction register contents, etc.
		Implementing the M88K subu.ci instruction.
		Removing the non-working (skeleton) Iyonix machine mode.
		OpenBSD/mvme88k reaches userland :-), starts executing
		/sbin/init's instructions, and issues a few syscalls, before
		crashing.
20070526	Fixing bugs in dev_mk48txx, so that OpenBSD/mvme88k detects
		the correct time-of-day.
		Implementing a generic IRQ controller for the test machines
		(dev_irqc), similar to a proposed patch from Petr Stepan.
		Experimenting some more with translation read-ahead.
		Adding an "expect" script for automated OpenBSD/landisk
		install regression/performance tests.
20070527	Adding a dummy mmEye (SH3) machine mode skeleton.
		FINALLY found the strange M88K bug I have been hunting: I had
		not emulated the SNIP value for exceptions occurring in
		branch delay slots correctly.
		Implementing correct exceptions for 64-bit M88K loads/stores.
		Address to symbol lookups are now disabled when M88K is
		running in usermode (because usermode addresses don't have
		anything to do with supervisor addresses).
20070531	Removing the mmEye machine mode skeleton.
20070604	Some minor code cleanup.
20070605	Moving src/useremul.c into a subdir (src/useremul/), and
		cleaning up some more legacy constructs.
		Adding -Wstrict-aliasing and -fstrict-aliasing detection to
		the configure script.
20070606	Adding a check for broken GCC on Solaris to the configure
		script. (GCC 3.4.3 on Solaris cannot handle static variables
		which are initialized to 0 or NULL. :-/)
		Removing the old (non-working) ARC emulation modes: NEC RD94,
		R94, R96, and R98, and the last traces of Olivetti M700 and
		Deskstation Tyne.
		Removing the non-working skeleton WDSC device (dev_wdsc).
20070607	Thinking about how to use the host's cc + ld at runtime to
		generate native code. (See experiments/native_cc_ld_test.i
		for an example.)
20070608	Adding a program counter sampling timer, which could be useful
		for native code generation experiments.
		The KN02_CSR_NRMMOD bit in the DECstation 5000/200 (KN02) CSR
		should always be set, to allow a 5000/200 PROM to boot.
20070609	Moving out breakpoint details from the machine struct into
		a helper struct, and removing the limit on max nr of
		breakpoints.
20070610	Moving out tick functions into a helper struct as well (which
		also gets rid of the max limit).
20070612	FINALLY figured out why Debian/DECstation stopped working when
		translation read-ahead was enabled: in src/memory_rw.c, the
		call to invalidate_code_translation was made also if the
		memory access was an instruction load (if the page was mapped
		as writable); it shouldn't be called in that case.
20070613	Implementing some more MIPS32/64 revision 2 instructions: di,
		ei, ext, dext, dextm, dextu, and ins.
20070614	Implementing an instruction combination for the NetBSD/arm
		idle loop (making the host not use any cpu if NetBSD/arm
		inside the emulator is not using any cpu).
		Increasing the nr of ARM VPH entries from 128 to 384.
20070615	Removing the ENABLE_arch stuff from the configure script, so
		that all included architectures are included in both release
		and development builds.
		Moving memory related helper functions from misc.c to memory.c.
		Adding preliminary instructions for netbooting NetBSD/pmppc to
		guestoses.html; it doesn't work yet, there are weird timeouts.
		Beginning a total rewrite of the userland emulation modes
		(removing all emulation modes, beginning from scratch with
		NetBSD/MIPS and FreeBSD/Alpha only).
20070616	After fixing a bug in the DEC21143 NIC (the TDSTAT_OWN bit was
		only cleared for the last segment when transmitting, not all
		segments), NetBSD/pmppc boots with root-on-nfs without the
		timeouts. Updating guestoses.html.
		Removing the skeleton PSP (Playstation Portable) mode.
		Moving X11-related stuff in the machine struct into a helper
		struct.
		Cleanup of out-of-memory checks, to use a new CHECK_ALLOCATION
		macro (which prints a meaningful error message).
		Adding a COMMENT to each machine and device (for automagic
		.index comment generation).
		Doing regression testing for the next release.

==============  RELEASE 0.4.6  ==============
1 /*
2 * Copyright (C) 2003-2007 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * $Id: bootblock.c,v 1.4 2007/06/15 17:02:39 debug Exp $
29 *
30 * Bootblock handling:
31 *
32 * o) For some machines (e.g. DECstation or the Dreamcast), it is
33 * possible to load a bootblock from a fixed location on disk, and
34 * simply execute it in memory.
35 *
36 * o) For booting from generic CDROM ISO9660 images, a filename of
37 * a file to load must be supplied (the kernel filename). It is
38 * loaded, possibly gunzipped, and then executed as if it was a
39 * separate file.
40 *
41 * TODO: This module needs some cleanup.
42 */
43
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47
48 #include "cpu.h"
49 #include "diskimage.h"
50 #include "emul.h"
51 #include "machine.h"
52 #include "memory.h"
53
54 static char *diskimage_types[] = DISKIMAGE_TYPES;
55
56
57 /*
58 * load_bootblock():
59 *
60 * For some emulation modes, it is possible to boot from a harddisk image by
61 * loading a bootblock from a specific disk offset into memory, and executing
62 * that, instead of requiring a separate kernel file. It is then up to the
63 * bootblock to load a kernel.
64 *
65 * Returns 1 on success, 0 on failure.
66 */
67 int load_bootblock(struct machine *m, struct cpu *cpu,
68 int *n_loadp, char ***load_namesp)
69 {
70 int boot_disk_id, boot_disk_type = 0, n_blocks, res, readofs,
71 iso_type, retval = 0;
72 unsigned char minibuf[0x20];
73 unsigned char *bootblock_buf;
74 uint64_t bootblock_offset, base_offset;
75 uint64_t bootblock_loadaddr, bootblock_pc;
76
77 boot_disk_id = diskimage_bootdev(m, &boot_disk_type);
78 if (boot_disk_id < 0)
79 return 0;
80
81 base_offset = diskimage_get_baseoffset(m, boot_disk_id, boot_disk_type);
82
83 switch (m->machine_type) {
84
85 case MACHINE_DREAMCAST:
86 if (!diskimage_is_a_cdrom(cpu->machine, boot_disk_id,
87 boot_disk_type)) {
88 fatal("The Dreamcast emulation mode can only boot"
89 " from CD images, not from other disk types.\n");
90 exit(1);
91 }
92
93 CHECK_ALLOCATION(bootblock_buf = malloc(32768));
94
95 debug("loading Dreamcast IP.BIN from %s id %i\n",
96 diskimage_types[boot_disk_type], boot_disk_id);
97
98 res = diskimage_access(m, boot_disk_id, boot_disk_type,
99 0, base_offset, bootblock_buf, 0x8000);
100 if (!res) {
101 fatal("Couldn't read the disk image. Aborting.\n");
102 return 0;
103 }
104
105 if (strncmp((char *)bootblock_buf, "SEGA ", 5) != 0) {
106 fatal("This is not a Dreamcast IP.BIN header.\n");
107 free(bootblock_buf);
108 return 0;
109 }
110
111 /* Store IP.BIN at 0x8c008000, and set entry point. */
112 store_buf(cpu, 0x8c008000, (char *)bootblock_buf, 32768);
113 cpu->pc = 0x8c008300;
114
115 /* Remember the name of the file to boot (1ST_READ.BIN): */
116 if (cpu->machine->boot_kernel_filename == NULL ||
117 cpu->machine->boot_kernel_filename[0] == '\0') {
118 int i = 0x60;
119 while (i < 0x70) {
120 if (bootblock_buf[i] == ' ')
121 bootblock_buf[i] = 0;
122 i ++;
123 }
124 CHECK_ALLOCATION(cpu->machine->boot_kernel_filename =
125 strdup((char *)bootblock_buf + 0x60));
126 }
127
128 debug("boot filename: %s\n",
129 cpu->machine->boot_kernel_filename);
130
131 free(bootblock_buf);
132
133 break;
134
135 case MACHINE_PMAX:
136 /*
137 * The first few bytes of a disk contains information about
138 * where the bootblock(s) are located. (These are all 32-bit
139 * little-endian words.)
140 *
141 * Offset 0x10 = load address
142 * 0x14 = initial PC value
143 * 0x18 = nr of 512-byte blocks to read
144 * 0x1c = offset on disk to where the bootblocks
145 * are (in 512-byte units)
146 * 0x20 = nr of blocks to read...
147 * 0x24 = offset...
148 *
149 * nr of blocks to read and offset are repeated until nr of
150 * blocks to read is zero.
151 */
152 res = diskimage_access(m, boot_disk_id, boot_disk_type, 0, 0,
153 minibuf, sizeof(minibuf));
154
155 bootblock_loadaddr = minibuf[0x10] + (minibuf[0x11] << 8)
156 + (minibuf[0x12] << 16) + ((uint64_t)minibuf[0x13] << 24);
157
158 /* Convert loadaddr to uncached: */
159 if ((bootblock_loadaddr & 0xf0000000ULL) != 0x80000000 &&
160 (bootblock_loadaddr & 0xf0000000ULL) != 0xa0000000) {
161 fatal("\nWARNING! Weird load address 0x%08"PRIx32
162 " for SCSI id %i.\n\n",
163 (uint32_t)bootblock_loadaddr, boot_disk_id);
164 if (bootblock_loadaddr == 0) {
165 fatal("I'm assuming that this is _not_ a "
166 "DEC bootblock.\nAre you sure you are"
167 " booting from the correct disk?\n");
168 exit(1);
169 }
170 }
171
172 bootblock_loadaddr &= 0x0fffffffULL;
173 bootblock_loadaddr |= 0xffffffffa0000000ULL;
174
175 bootblock_pc = minibuf[0x14] + (minibuf[0x15] << 8)
176 + (minibuf[0x16] << 16) + ((uint64_t)minibuf[0x17] << 24);
177
178 bootblock_pc &= 0x0fffffffULL;
179 bootblock_pc |= 0xffffffffa0000000ULL;
180 cpu->pc = bootblock_pc;
181
182 debug("DEC boot: loadaddr=0x%08"PRIx32", pc=0x%08"PRIx32,
183 (uint32_t) bootblock_loadaddr, (uint32_t) bootblock_pc);
184
185 readofs = 0x18;
186
187 for (;;) {
188 res = diskimage_access(m, boot_disk_id, boot_disk_type,
189 0, readofs, minibuf, sizeof(minibuf));
190 if (!res) {
191 fatal("Couldn't read the disk image. "
192 "Aborting.\n");
193 return 0;
194 }
195
196 n_blocks = minibuf[0] + (minibuf[1] << 8)
197 + (minibuf[2] << 16) + ((uint64_t)minibuf[3] << 24);
198
199 bootblock_offset = (minibuf[4] + (minibuf[5] << 8) +
200 (minibuf[6]<<16) + ((uint64_t)minibuf[7]<<24)) * 512;
201
202 if (n_blocks < 1)
203 break;
204
205 debug(readofs == 0x18? ": %i" : " + %i", n_blocks);
206
207 if (n_blocks * 512 > 65536)
208 fatal("\nWARNING! Unusually large bootblock "
209 "(%i bytes)\n\n", n_blocks * 512);
210
211 CHECK_ALLOCATION(bootblock_buf = malloc(n_blocks*512));
212
213 res = diskimage_access(m, boot_disk_id, boot_disk_type,
214 0, bootblock_offset, bootblock_buf, n_blocks * 512);
215 if (!res) {
216 fatal("WARNING: could not load bootblocks from"
217 " disk offset 0x%llx\n",
218 (long long)bootblock_offset);
219 }
220
221 store_buf(cpu, bootblock_loadaddr,
222 (char *)bootblock_buf, n_blocks * 512);
223
224 bootblock_loadaddr += 512*n_blocks;
225 free(bootblock_buf);
226 readofs += 8;
227 }
228
229 debug(readofs == 0x18? ": no blocks?\n" : " blocks\n");
230 return 1;
231 }
232
233
234 /*
235 * Try reading a kernel manually from the disk. The code here
236 * does not rely on machine-dependent boot blocks etc.
237 */
238 /* ISO9660: (0x800 bytes at 0x8000 + base_offset) */
239 CHECK_ALLOCATION(bootblock_buf = malloc(0x800));
240 res = diskimage_access(m, boot_disk_id, boot_disk_type,
241 0, base_offset + 0x8000, bootblock_buf, 0x800);
242 if (!res) {
243 fatal("Couldn't read the disk image. Aborting.\n");
244 return 0;
245 }
246
247 iso_type = 0;
248 if (strncmp((char *)bootblock_buf+1, "CD001", 5) == 0)
249 iso_type = 1;
250 if (strncmp((char *)bootblock_buf+1, "CDW01", 5) == 0)
251 iso_type = 2;
252 if (strncmp((char *)bootblock_buf+1, "CDROM", 5) == 0)
253 iso_type = 3;
254
255 if (iso_type != 0) {
256 /*
257 * If the user specified a kernel name, then load it from
258 * disk.
259 */
260 if (cpu->machine->boot_kernel_filename == NULL ||
261 cpu->machine->boot_kernel_filename[0] == '\0')
262 fatal("\nISO9660 filesystem, but no kernel "
263 "specified? (Use the -j option.)\n");
264 else
265 retval = iso_load_bootblock(m, cpu, boot_disk_id,
266 boot_disk_type, iso_type, bootblock_buf,
267 n_loadp, load_namesp);
268 }
269
270 if (retval != 0)
271 goto ret_ok;
272
273 /* Apple parition table: */
274 res = diskimage_access(m, boot_disk_id, boot_disk_type,
275 0, 0x0, bootblock_buf, 0x800);
276 if (!res) {
277 fatal("Couldn't read the disk image. Aborting.\n");
278 return 0;
279 }
280 if (bootblock_buf[0x000] == 'E' && bootblock_buf[0x001] == 'R' &&
281 bootblock_buf[0x200] == 'P' && bootblock_buf[0x201] == 'M') {
282 if (cpu->machine->boot_kernel_filename == NULL ||
283 cpu->machine->boot_kernel_filename[0] == '\0')
284 fatal("\nApple partition table, but no kernel "
285 "specified? (Use the -j option.)\n");
286 else
287 retval = apple_load_bootblock(m, cpu, boot_disk_id,
288 boot_disk_type, n_loadp, load_namesp);
289 }
290
291 ret_ok:
292 free(bootblock_buf);
293 return retval;
294 }
295
296
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